If the problem persists with the latest build please do the following:
- Navigate to Start -> Run;
- Type in "drwtsn32";
- Remember the log file path and the crash dump path;
- Start Acronis True Image and create a new task using Schedule Task wizard, but do not schedule it (on the Start Parameters page choose "Do not start automatically"). Set the name of the new task to "Test Task".
- Download the following file from www.acronis.com:

- Unpack the files into the \Program Files\Acronis\TrueImage folder.
- Open the \Documents and Settings\[User]\Application Data\Acronis\TrueImage\Scripts\ folder and find the script file with the following parameter inside: display name="Test Task".
- Copy the script file to the \Program Files\Acronis\TrueImage folder.
- Start Command Prompt from Start\Accessories program menu.
- Type the following commands in the shell window:

- Reproduce the problem;
- Send Dr. Watson's log and dump files from the afore-mentioned paths to support@acronis.com along with the link to this thread.
- Also please send us the ti.log file from the \Program Files\Acronis\TrueImage folder.

Arrgh - seems like the cure is worse than the illness!!!
Actually I am now wondering if TI is entirely to blame - I have two scheduled incremental images, one to external USB drive and one to Acronis Secure Zone.
Although the first to the external USB drive failed as above, the following one to the Acronis Secure Zone completed. In the circumstances I have made a new full image to the USB drive and will try the scheduled incremental again, maybe some corruption had occurred to the original image.